Kumar, Ashok, et al. “Production Potential of Rainfed Pearl Millet (Pennisetum Glaucum)-Castor (Ricinus Communis) Intercropping at Different Fertility Levels”. The Indian Journal of Agricultural Sciences, vol. 65, no. 5, May 2012, https://epubs.icar.org.in/index.php/IJAgS/article/view/18287.